Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Interface Friction Testing Between Soil an a Bituminous Geomembrane
The Los Angeles Department of Water and Power is planning to build two side-by-side reinforced concrete reservoir structures in the southeastern San Fernando Valley of Los Angeles. An important part of the operations of the reservoirs will be a detection system below the bottom of the reservoirs to determine if there are leaks or discharges of water. It is planned to use a bituminous geomembrane (BGM) beneath the reservoirs to collect any leakage and convey the water to a monitoring location outside of the reservoirs. Because of regulatory requirements, the design earthquake ground motions are quite high and there was concern that a plane of weakness would be present at the interface with either the predominantly granular soils beneath the BGM or the Class 2 permeable material above the BGM. Direct shear testing (ASTM D5321) was performed to determine the soil friction for these two interfaces. The test results indicate that the critical sliding plane is the BGM/Fill interface for low confining pressures (less than about 70 kN/m2) such as for empty reservoir case and the BGM/Class 2 interface for medium to high confining pressures (70 to 250 kN/m2) such as for full reservoir case. As expected, the Class 2 permeable material has sufficient frictional resistance within itself to be not the weakest sliding plane. The sustained loading condition (24-hour) as expected in the field would in-fact yield higher interface frictional strength than the design values. The tensile resistance of the BGM would be engaged for higher confining pressures such as when the reservoir is full. The maximum shearing resistance (load) on the BGM surface is expected to be about 192 kN/m2 (4,000 pounds per square foot) for the full reservoir condition. In the event of excessive leakage through the reservoir or rise in groundwater level that could saturate the compacted fill, the interface friction tests indicate that the reduction in frictional strength upon saturation is relatively minor for both BGM/Fill and BGM/Class 2 interfaces.
Interface Friction Testing Between Soil an a Bituminous Geomembrane
The Los Angeles Department of Water and Power is planning to build two side-by-side reinforced concrete reservoir structures in the southeastern San Fernando Valley of Los Angeles. An important part of the operations of the reservoirs will be a detection system below the bottom of the reservoirs to determine if there are leaks or discharges of water. It is planned to use a bituminous geomembrane (BGM) beneath the reservoirs to collect any leakage and convey the water to a monitoring location outside of the reservoirs. Because of regulatory requirements, the design earthquake ground motions are quite high and there was concern that a plane of weakness would be present at the interface with either the predominantly granular soils beneath the BGM or the Class 2 permeable material above the BGM. Direct shear testing (ASTM D5321) was performed to determine the soil friction for these two interfaces. The test results indicate that the critical sliding plane is the BGM/Fill interface for low confining pressures (less than about 70 kN/m2) such as for empty reservoir case and the BGM/Class 2 interface for medium to high confining pressures (70 to 250 kN/m2) such as for full reservoir case. As expected, the Class 2 permeable material has sufficient frictional resistance within itself to be not the weakest sliding plane. The sustained loading condition (24-hour) as expected in the field would in-fact yield higher interface frictional strength than the design values. The tensile resistance of the BGM would be engaged for higher confining pressures such as when the reservoir is full. The maximum shearing resistance (load) on the BGM surface is expected to be about 192 kN/m2 (4,000 pounds per square foot) for the full reservoir condition. In the event of excessive leakage through the reservoir or rise in groundwater level that could saturate the compacted fill, the interface friction tests indicate that the reduction in frictional strength upon saturation is relatively minor for both BGM/Fill and BGM/Class 2 interfaces.
Interface Friction Testing Between Soil an a Bituminous Geomembrane
Lew, M. (Autor:in) / Ponnaboyina, H. (Autor:in) / Davis, C.A. (Autor:in) / Perez, A. (Autor:in)
2013
10 Seiten, Bilder, Tabellen, Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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